Change Salinity Standard Deviation Max To 0.506 (#367)

This is to support reducing the bitpacked message size for standard
deviation from 9 to 8 bits on the Spotter platform

Author: matt001k

src/apps/bridge/sensor_drivers/aanderaaConductivitySensor.h

@@ -167,7 +167,7 @@ typedef struct AanderaaConductivitySensor : public AbstractSensor {
    * Accounts for timing slop between sensor sampling and bridge aggregation periods.
    */
   static constexpr uint32_t N_SAMPLES_PAD = 150;
-  static constexpr double SALINITY_STD_DEV_MAX = 0.1018;
+  static constexpr double SALINITY_STD_DEV_MAX = 0.506;
 
   /**
    * @brief Default aggregation structure with NaN values